1 feb 1917 año - First Use of Submarines

Descripción:

- Germany was the first to use submarines on February 1, 1917.
- They called them U-boats, which stood for underwater boats.
- On February 1, 1917, Germany sank about 5,000 British ships.
- This was the first use of technology world wide.
- MANY BRITISH SHIPS WERE SUNK.
- ONE OF THE CAUSES TO THE U.S. DECLARING WAR ON GERMANY.

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